聚合
聚合物
高分子化学
分散性
活性聚合
自由基聚合
材料科学
配位聚合
离子聚合
化学
化学工程
复合材料
工程类
作者
Yi Wu,Tianhao Nan,Xiangling Ji,Bo Liu,Dongmei Cui
标识
DOI:10.1002/anie.202205894
摘要
Many efforts have been devoted to preparing star polymers. Research into coordination polymerization, the most powerful stereoselective process to endow polymers with superb properties, lags far behind those achieved by radical polymerization and ionic polymerization. Herein, we propose a facile strategy to prepare star polymers with regular arms based on coordination polymerization via an insertion reaction between the carbon-heteroatom unsaturated bond and the metal-alkyl species. Terminating a living cis-1,4-selective isoprene polymerization by using isocyanate as cross-linker (CL), a star polyisoprene with low polydispersity was obtained in high yield (91.8 %). A kinetic study showed the star polymer was formed via a step-growth procedure. The types of CL and the ratio of [CL]0 : [Cat.]0 are key factors to determine the arm number and the yield of star polymer. Finally, synthetic IR rubber with a green strength up to 1.99 MPa superior to natural rubber (1.43 MPa) was prepared for the first time.
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